Book Image

WCF 4.0 Multi-tier Services Development with LINQ to Entities

By : Mike Liu
Book Image

WCF 4.0 Multi-tier Services Development with LINQ to Entities

By: Mike Liu

Overview of this book

WCF is the Microsoft model for building services, whereas LINQ to Entities is the Microsoft ORM for accessing underlying data storage. Want to learn both? You would normally have to dig through huge reference tomes—so wouldn't you agree that a simple-to-follow practical tutorial on WCF and LINQ to Entities is the way to get ahead?This book is the quickest and easiest way to learn WCF and LINQ to Entities in Visual Studio 2010. WCF and LINQ to Entities are both powerful yet complex technologies from Microsoft—but you will be surprised at how easily this book will get you get up and running with them.Mastery of these two topics will quickly enable you to create Service-Oriented applications, and allow you to take your first steps into the world of Service Oriented Architecture without becoming overwhelmed.Through this book, you will learn what's going on behind the scenes with WCF, and dive into the basic yet most useful techniques for LINQ to Entities. You will develop three real-world multi-tiered WCF services from beginning to end, with LINQ to Entities being used in the data access layer of the services. Various clients including windows console applications, the WCF Test Client, Windows Form applications and WPF applications will be created to test these WCF services. By the end of this book, you will be 100% confident that you know WCF and LINQ to Entities, not only in theory, but with sound real-world experience.
Table of Contents (16 chapters)
WCF 4.0 Multi-tier Services Development with LINQ to Entities
About the Author
About the Reviewers

Built-in LINQ operators

As we have seen in previous sections, there are no semantic differences between method syntax and query syntax. In addition, some queries such as those that retrieve the number of elements matching a specified condition or those that retrieve the element that has the maximum value in a source sequence, can be expressed only as method calls. These kinds of methods are sometimes referred to as .NET Standard Query Operators and include Take, ToList , FirstOrDefault , and Max and Min .

In addition to those methods that can only be expressed as method calls, all the extension methods that can be used in either query syntax or method syntax are also defined as standard query operators such as select, where, and from. So the .NET Standard Query Operators contains all of the LINQ-related methods.

A complete list of these operators can be found at the Microsoft MSDN library for the class, System.Linq.Enumerable.

To have a quick look at all those operators, open the program...